Holosun HE507K-GR-X2 Compact Pistol Red Dot Sight - Green ACSS® Vulcan® Dot Reticle

Manufactured by Holosun
Manufactured by Holosun
17 Reviews

In Stock

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Made as a collaboration between Holosun Optics and Primary Arms Optics, the green-illuminated HE507K-GR-X2 with ACSS® Vulcan® Dot Reticle brings the revolutionary Vulcan aiming system to a micro reflex footprint.

Designed for concealed carry, the HE507K-GR-X2-ACSS is lightweight, durable, and dependable, with up to a 40,000-hour runtime on medium settings. This sight retains all the core features and technologies of the standard Holosun model, including the Multi-Reticle System, Shake Awake technology, and a built-in Lock Mode. With 12 green-illuminated brightness settings and intuitive push-button controls, the HE507K-GR-X2-ACSS works in any lighting condition and is even compatible with night vision devices.

  • Green-Illuminated ACSS® Vulcan® Dot Reticle System
  • Ultra-compact size for concealed carry applications.
  • Two Reticle Settings: Dot + Circle, and Dot only
  • Shake Awake™ - Motion on with last setting recall.
  • Parallax-free, unlimited eye relief.
  • CNC milled 7075 Aluminum Housing.
  • 10 daylight and 2 night vision compatible brightness settings.
  • IP67 Certified.

This co-branded optic features the ACSS® Vulcan® Dot reticle system, which improves acquisition and recovery speed through its patented outer reference circle. When aimed on-target, the ACSS Vulcan Dot reticle appears as a simple, unobtrusive 3 MOA dot. When your aim is off-target, the edge of the 230 MOA outer circle guides you back to center. ACSS Vulcan Dot alleviates one of the main weaknesses of micro reflex optics, ensuring you can always find your reticle aiming point, despite the smaller optical aperture.

This version of the optic uses GREEN reticle illumination. For many, green reticle illumination appears brighter and sharper than red reticles, improving acquisition speed. For RED illumination, the HS507K-X2-ACSS offers the same features but with a red LED emitter.

The HE507K-GR-X2 with ACSS Vulcan Dot Reticle features an RMSc footprint and is natively compatible with many of the most popular concealed carry pistols.
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Battery Life25,001 - 50,000 Hours
Battery TypeCR1632 3V Lithium Coin
Click Value1 MOA
FinishHardcoat Anodized
MaterialAluminum - 7075-T6
Mount CompatibilityHolosun 407K/507K
Night Vision CompatibleNight Vision Compatible
Reticle ColorGreen
Warrantylimited lifetime
Weight1.0 Oz
California Prop 65 warning

 WARNING: This product can expose you to chemicals, which are known to the State of California to cause Cancer and Reproductive Harm. For more information go to www.P65Warnings.ca.gov.

Ratings & Reviews

17 reviews

  • 4 stars
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  • 2 stars
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ACSS Wizardry

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If you've seen the C version, you know what to expect. This thing is magic. Makes it a breeze shooting on the move or with your non dominant hand. Have not been able to run it under nods yet, but will soon. But it has the durability of the Holosuns and now it has the best reticle possible as well. Awesome to have on your carry gun.

HIgh hopes

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I had high hopes for this optic and hopefully it was defective out of the factory.
I went to zero the optic (12/25) and noticed an odd peculiar behavior as I adjusted elevation. Windage began moving at the same time. After getting zero, I set down the pistol to load a new magazine and reloaded. Upon reload from slide lock, zero had shifted 6 MOA to the right. I reset zero and a tap to the pistol had zero move again. I tapped the pistol on the other size and zero came back.
I will update this upon an exchange/swap out.

Thank you for taking the time to speak with us today. We are glad to hear your replacement optic did not have this issue and we got you taken care of. Please do not hesitate to reach out if you have any questions.

This is “the one to get”


Tthe magic is this: It’s unusually helpful because it allows you to focus your mental energy on what you’re looking at down-range, rather than spending mental energy thinking about “finding the dot.” This is not training wheels, this is working with physiology to give your body the ability to consistently maintain “Vistula contact” with the reticle so your body maintains automatic, almost unconscious awareness of it’s location within space (proprioception).

Well worth the money

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This is the greatest red dot ever. I have always had trouble locating a dot when drawing which would be even worse under a stressful situation. Not any more. The large outer halo instantly directs me to the red dot. Easy side battery change , shake awake, auto shutoff and easy to reach manual intensity settings. Everything you need from a red dot. I am a convert. I changed all 5 of my handguns to the ACSS vulcan dot.

Clear Green Dot

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I got this for my X Macro and it fit with no problems. I thought that the green dot would be better for my astigmatism and even though it's still blurry, it looks better than the red dot. The sight is small so IWB carry is still easy. Only inconvenience that I knew about before I bought it was having to clean the lens a few times a week so the lint and dust doesn't collect. Not a big deal and still recommend this sight. Fast shipping too! 2 day wait and it was at my door. Thanks!


by -

I bought this for my Shadow Systems CR920P . The green dot is better for my astigmatism . Once you use the ACSS you will never go back to a regular dot sight . Love it . I do wish they would make it with the Chevron .

HE507K on Ruger Security 380


I have "6" HE507C-X2-ACSS on pistols and carbines and just love them.
I bought this for my Ruger Security 380 . The green color is better than the red for me by far . Once you use the ACSS you will never go back to a regular dot sight . Love it . I also do wish they would make it with the Chevron tho. It seems like it would be easy to do.


by -

I love it. Its definitely faster then just a plan dot.

Best reticle

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Perfect !!

Perfect for EDC

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I have this green dot directly mounted on my P365x, no plates needed. Its very easy to find the dot with the dummy donut, especially with one hand shooting.